|Publication number||US8105225 B2|
|Application number||US 11/451,793|
|Publication date||Jan 31, 2012|
|Filing date||Jun 13, 2006|
|Priority date||Apr 20, 1998|
|Also published as||US6820395, US7059099, US20020152723, US20050034422, US20060228056|
|Publication number||11451793, 451793, US 8105225 B2, US 8105225B2, US-B2-8105225, US8105225 B2, US8105225B2|
|Original Assignee||Illinois Tool Works Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (18), Referenced by (2), Classifications (24), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a divisional of U.S. application Ser. No. 10/945,313, filed Sep. 20, 2004, now U.S. Pat. No. 7,059,099, which is a divisional of U.S. application Ser. No. 10/167,809, filed on Jun. 12, 2002, now U.S. Pat. No. 6,820,395, which is a continuation-in-part of U.S. application Ser. No. 09/633,944 filed on Aug. 8, 2000, now U.S. Pat. No. 6,694,704, which is a division of U.S. application Ser. No. 09/292,256, filed on Apr. 15, 1999, which claims priority under 35U.S.C. §119 of French patent application 98 04913 filed Apr. 20, 1998, French patent application 98 06292 filed May 19, 1998.
1. Field of the Invention
This invention relates to automatic package forming, filling and sealing machines involving fasteners, for example, with complementary male and female profiles. Specifically, a package is formed by moving a length of thermoplastic film and attaching to the film sequentially and crosswise with reference to the direction of movement of the film, a fastener including a first strip supporting one reclosable profile engaged with another reclosable profile that is complementary thereto and supported by a second strip or a part of the first strip, which will subsequently be attached to the film.
2. Description of the Prior Art
U.S. Pat. No. 4,909,017 to McMahon et al. describes a process in which bags are provided with a fastener when they are formed on a forming, filling and sealing (FFS) machine. The bags are formed from a film of thermoplastic material. The film is in the form of a strip of material extending between two free edges that are longitudinal with reference to the movement of the film. This film is unrolled upstream of a filling tube. The fastener is positioned on the film, also upstream of the filling tube and transversely with respect to the direction of movement of the film. The fastener comprises two strips provided with complementary profiles. A first strip of the fastener is welded to the film upstream of the tube, on a portion of the film which is intended to form a first bag wall. The bag is then formed by enveloping the tube and welding the two longitudinal edges of the film. The second fastener is then welded below the tube to a second bag wall.
U.S. Pat. No. 4,655,862 to Christoff et al. also describes a process for forming reclosable bags on FFS machines, in which bags are provided with a fastener positioned at right angles to the direction of formation of these bags. This fastener is placed below the filling tube on a film in the form of a single strip. This strip includes at least one fold zone crosswise to the strip so that the strip can be folded back on itself, and areas of the strip that can work together to seal the bag can be brought opposite one another.
It is therefore an object of the present invention to make the steps involving the support, welding and installation of the fastener on the film easier to perform than in the processes described in the above-cited references.
The above and other beneficial objects of the present invention are attained by providing a process for the fabrication of a film material intended to form the bags, including steps of moving the film and fixing fasteners sequentially on the film and transversely with reference to the direction of movement of the film. The fastener comprises a first strip supporting at least one reclosable profile in engagement with another reclosable profile, which is complementary thereto and is supported by a second strip or a part of the first strip. The second strip or the part of the first strip that supports the other profile will be subsequently fixed to the film. Each strip has at least one web extending laterally on one side of the profile or profiles supported thereby.
These webs give the invention a number of advantages. Because of its larger cross-section, a fastener for implementing the process according to the invention is easily moved and positioned. In addition, the webs can be attached at sufficiently low temperatures to prevent damaging the profiles.
It is also possible for the step of attaching the fastener to the film to be performed by sealing the film with at least one area of these webs different from the area located under the profiles to prevent damage to the profiles during the attaching step.
The above and other aspects, purposes and advantages of the invention will be apparent from the following detailed description. The invention will also be more fully understood when read in conjunction with the accompanying drawings, in which:
Referring now to the drawings in detail wherein like numerals indicate like elements throughout the several views,
These fasteners include two strips 2, 4. As shown in the figure, the strips 2, 4 respectively include webs 6, 8 and fastener profiles 10, 12. Profiles 10, 12 extend on the strips 2, 4 in the longitudinal direction thereof. Profiles 10, 12 have forms capable of interlocking in a complementary manner. For example, one of the profiles 10, known as the male profile, has the shape of an arrowhead in cross-section. Profile 10 can be introduced and kept engaged in profile 12, known as the female profile, which is in the form of a groove. Each strip 2, 4 can have a number of profiles 10, 12 similar, for example, to those described above. These profiles 10, 12 are then parallel to each other. Strips 2, 4 respectively include a first web 6 and a second web 8, which extend substantially laterally on one side of the profiles 10, 12.
According to certain variants of the invention, the first web 6 and the second web 8 can be replaced by a first part 6 and a second part 8 of a single web that makes it possible to join the two strips 2, 4.
The fasteners shown in
These fasteners 1 are particularly adapted to be attached to the film 50 by the process according to the invention, since the surface of the webs 6, 8 permits welding onto the film 50 on an area of the webs not under profiles 10, 12. This facilitates placement of the fastener 1 and welding the same to the film 50. Preferably, at least one web 6, 8 extends sideways onto an area at least equal in surface area to the area located under profiles 10, 12. Preferably, the process according to the invention is used to form reclosable bags 30 on an FFS machine 100, shown in
In this case, during the process according to the invention, the step of attaching the first web to a film 50 is executed upstream of a filling tube 130 of the FFS machine 100. The film 50 moves toward the tube 130 in the direction indicated by arrow D. The film 50 has two free longitudinal edges 52, 54 parallel to its direction of movement.
A fastener 1 is brought crosswise with respect to the direction D of the movement of the film 50. As shown in
Preferably, the length of the fastener 1 is approximately equal to half the size of the film 50 with respect to the direction of movement D thereof. The fastener 1 may be placed near one of the longitudinal edges 52, 54 of the film 50. Preferably, the fastener 1 is attached approximately centered with respect to the two longitudinal edges 52, 54. The fastener 1 is guided, pulled or pushed by roller-equipped means and/or by a two-way mechanism so that it is properly positioned on the surface of the film 50. The fastener 1 is positioned on a portion of the film 50 suitable for forming a first bag wall so that one of the two strips 2, 4 is placed flat on one face of the film 50. The strip 2 with the first web 6 rests on the surface of the film 50. Prior to being positioned on the film 50, fastener 1 is advantageously provided with two spot welds 42, 44. Each spot weld 42, 44 is situated at one longitudinal end 3, 5 of the strips 2, 4 and, more particularly, at the location of profiles 10, 12, and thus helps ensure that the fastener 1 is watertight at the longitudinal ends of the profiles 10, 12.
Fastener 1 is placed on the film 50 under first transversal welding means 110. These first transversal welding means 110, for example, include a welding bar 112 that is crosswise with respect to the direction of movement D of the film 50, and two welding bars 114 that are longitudinal with respect to the direction of movement D of the film 50. The length of the welding bar 112 is approximately equal to that of fastener 1. The two welding bars 114 are located at the ends of the welding bar 112, at right angles thereto, and the welding bars 114 are approximately equal in length to the width of fastener 1. The welding bars 112, 114 are lowered and pressed onto the edge of webs 6, 8, either together or independently of each other.
Thus, according to one variant of the process, the step of attaching the first web 6 to the film 50 is performed only at the longitudinal ends 3, 5 of the strips 2, 4 by the longitudinal welding bars 114. According to another variant of the process, the first web 6 is attached to the film 50 through the welding bar 112 only on the edge of the web 6 which will be toward the outside of the reclosable bag 30 with respect to profiles 10, 12 when the reclosable bag 30 is formed. According to still another variant of the process, the first web 6 is attached upstream of the tube 130 by combining the two preceding variants.
According to still another variant of the process, the second web 8 of the fastener, shown in
Alternatively, for certain fasteners 1 the first web 6 is attached at no less than two points 47, 49 situated on either side of the profile 10 supported by the first web 6 with respect to the longitudinal direction. The first web 6 is thus attached as part of the film 50 at a given point toward the front and at a point located to the rear with respect to the direction of movement D. This makes it possible to prevent fastener 1 from being turned around during the formation of the reclosable bag 30 on the tube 130 (
Alternatively, the fastener 1 can be attached to the film 50 prior to forming the reclosable bag 30 at the same time the spot welds 42, 44 are being made. In this case, the fastener 1 is moved on the film 50 even if the spot welds 42, 44 have not been made. Then, once the fastener 1 is in place, appropriate longitudinal welding bars 114 weld the longitudinal ends 3, 5 of strips 2, 4 in the same operation that makes the weld points 42, 44.
The reclosable bag 30 has two longitudinal folds 31, 33 and an opening that is closed by fastener 1. The reclosable bag 30 is hennetically sealed by the longitudinal weld 40 and one transversal weld 46. The transversal weld 46 extends between the longitudinal folds 31, 33 and is located on the edge of the walls 32, 34 longitudinally opposed to the fastener 1.
As shown in
Preferably, the second transversal welding means 116 also includes grooves 117, which extend over the entire length of the second transversal welding means 116. The grooves 117 of each of the second welding means 116 are facing one another and are turned toward each another to form a cavity. These grooves 117 make it possible to avoid welding the walls 32, 34 in a small transversal area downstream of the fastener 1. This transversal area makes it possible to form tongues 36, 38 that allow the walls 32, 34 to be grasped to spread the walls apart and to open the reclosable bag 30. Alternatively, the formed tongues 36, 38 may be sealed at a peel seal 57 to provide a protective film around the fastener 1 and the attached slider 9, as shown in
A number of additional variants of the fastener 1 for implementing the process according to the invention will be described hereinbelow. According to one of these variants, the fastener 1 includes the slider 9. The slider 9 can be of any known type capable of engaging the profiles 10, 12 when moved in a first direction and disengaging the profiles 10, 12 when moved in a second direction opposite the first direction. The process of making film 50 must be adapted to attach fasteners 1 with the slider 9. In one variant, as shown in
Another variant of access to the slider 9 is to seal the tongues 36, 38 at a peel seal 57 to form film extensions to protect the fastener 1 and the attached slider 9, as shown in
The fastener 1 is already provided with the slider 9, and the longitudinal ends 3, 5 are possibly already welded together at spot welds 42, 44 which can act as end stops. The fastener 1 is therefore positioned and attached by the welding means 110 so that the slider 9 is on the longitudinal edge of the fastener 1, located toward the front with respect to the direction of movement D of the film 50.
When using a cutout to access the slider, at least one of the webs 6, 8 is welded to the film 50 on at least one edge of the first cutout 51 by the first transversal welding means 110. The film 50, thus provided with the fastener 1, is shaped in the form of a cylinder around the tube 130. A longitudinal weld 40 is formed by the longitudinal welding means 120. A second cutout 53 may be made downstream of the longitudinal welding means 120. The second cutout 53 would be made in the film 50 opposite to the first cutout 51, with the shape and dimension of this second cutout 53 being the same as those of the first cutout 51. A second cutout is made by a blade 135. If the blade 135 is located at the location of the tube 130, the blade 135 is curved. The fastener 1 is then welded by the second transversal welding means 116. The shape of second transversal welding means 116 is adapted to weld fasteners 1 that include the slider 9 by allowing passage of the slider by a groove 118 to the area of the weld.
Examples of transversal welding means are illustrated in
As shown in FIGS. 5A and 27-27D, according to another variant of the second transversal welding means 116, these means have a U-shaped cross-section. This shape creates grooves 117 that form a cavity capable of receiving profiles 10, 12 and the slider 9 without deforming them when the welding bars of the second welding means 116 are pressed against each other to form the transversal welds 46, 48 and/or the peel seal 57.
Other methods can be envisaged for attaching a fastener 1 with the slider 9 to a film 50. In particular, it is possible to clear access to the slider 9 when making the cutouts 51, 53 in ways other than those described above.
As shown in
With regard to the second transversal welding means 116,
This thin web 7 can easily be tom to open the reclosable bag 30, but it ensures that the fastener 1 is substantially watertight. If thin web 7 extends sufficiently, it can be turned inside out toward and between the webs 6, 8 when the contents of the reclosable bag 30 are emptied to protect profiles 10, 12 from the contents of the reclosable bag 30. Profiles 10, 12, thus protected, remain clean and able to work together effectively when reclosing the reclosable bag 30. Thin web 7 can also form a funnel or a pouring spout when it is pulled out from the reclosable bag 30 as shown, for example, in
For instance, to form a pouring spout, the thin web 7 comprises two substantially trapezoidal-shaped elements placed one above the other and joined together at the two non-parallel edges of the trapezoids and on the shorter of the two parallel edges. The length of the longer of the two parallel edges of the trapezoid is equal to the dimension of the reclosable bag 30 transversely with respect to the direction of movement D of the film 50. These two non-parallel edges are welded between and with the longitudinal ends 3, 5 facing strips 2, 4.
Advantageously, one of these weld points 47, 49 is located on the side of the profiles 10, 12 which will be inside the reclosable bag 30 once it is formed. In this case, no equivalent facing weld point will be made on the second web 8. Thus, a hinged configuration is created that gives the reclosable bag 30 greater resistance to internal pressure as seen, for example, in
It will be appreciated that the gasket membrane 26 of the several embodiments described above may, if of sufficient thickness, be provided for maintaining the profiles 10, 12 out of engagement when attaching the fastener 1 to walls 32, 34. It will be further appreciated that if the gasket membrane 26 is interposed between engaged or interlocked profiles 10, 12, and a pulling action is enacted on the walls 32, 34 of a formed reclosable bag 30, the gasket membrane 26 will act to separate the engaged or interlocked profiles 10, 12.
It is clear that the invention also extends to a machine for producing a film 50 to be used to form reclosable bags 30, including first welding means 110, which are transverse to the direction of movement of the film 50 and are capable of attaching a fastener 1 with webs 6, 8 to this film 50.
Thus, one obtains a film 50 for forming reclosable bags 30 with fasteners 1. These fasteners 1 may be attached to the film 50 by only a first web 6. Reclosable bags 30 may then be formed and completed from this film 50 provided with fasteners 1, either on a bag forming machine to be used and filled later or on an FFS machine.
The invention therefore also covers a forming, filling and sealing machine which includes first transversal welding means 110 upstream of a filling tube 130 and second transversal welding means 116 below the tube 130. The term “transversal” is to be understood herein to refer to the direction of movement of the film 50.
It will be appreciated that, although the gasket membrane 26 has beer. described hereinabove as being welded or attached to one or both of the webs 6, 8, the gasket membrane 26 may alternatively be welded or otherwise attached to one or both of the walls 32, 34 of the reclosable bag 30.
Thus, the several aforementioned objects and advantages of the invention are most effectively attained. Although preferred embodiments of the invention have been disclosed and described in detail herein, it should be understood that this invention is in no sense limited thereby and its scope is to be determined by that of the appended claims.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8955293 *||Jun 7, 2012||Feb 17, 2015||Illinois Took Works Inc.||Reclosable bag and zipper therefor|
|US20120245009 *||Jun 7, 2012||Sep 27, 2012||Illinois Tool Works Inc.||Reclosable bag and zipper therefor|
|U.S. Classification||493/213, 493/212, 493/214|
|International Classification||B65B9/20, B31B1/90, B65D33/25, B31B19/90|
|Cooperative Classification||B31B2219/9022, B65D33/2508, B65B9/20, B65D33/2591, B31B19/90, B65D33/2533, B65D33/2525, B65B61/188, B65D33/2541|
|European Classification||B65D33/25A1C, B65B61/18E, B65D33/25A1A, B65D33/25A3, B65D33/25C, B65D33/25A, B65B9/20, B31B19/90|
|Jun 13, 2006||AS||Assignment|
Owner name: ILLINOIS TOOL WORKS, INC., ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AUSNIT, STEVEN;REEL/FRAME:017973/0857
Effective date: 20020610
|Sep 11, 2015||REMI||Maintenance fee reminder mailed|
|Jan 31, 2016||LAPS||Lapse for failure to pay maintenance fees|
|Mar 22, 2016||FP||Expired due to failure to pay maintenance fee|
Effective date: 20160131